{"schemaVersion":3,"id":"CVE-2019-1886","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"A vulnerability in the HTTPS decryption feature of Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to insufficient validation of Secure Sockets Layer (SSL) server certificates. An attacker could exploit this vulnerability by installing a malformed certificate in a web server and sending a request to it through the Cisco WSA. A successful exploit could allow the attacker to cause an unexpected restart of the proxy process on an affected device.","dates":{"published":"2019-07-04T19:50:10.367Z","modified":"2024-11-19T19:03:49.939Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":8.6,"severity":"high","version":"3.0","versionLabel":"v3.0","source":"CVE.org","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.0","versionLabel":"v3.0","source":"CVE.org","score":8.6,"severity":"high","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":8.6,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.0","versionLabel":"v3.0","source":"NVD","score":8.6,"severity":"high","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":5,"severity":"medium","vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.01347,"percentile":0.71052,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.01347},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01347,"percentile":0.71052}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.01347,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.01347,"percentile":0.71052}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-20","name":"Improper Input Validation","description":"The product receives input or data, but it does\n        not validate or incorrectly validates that the input has the\n        properties that are required to process the data safely and\n        correctly.","type":"weakness","status":"Stable","abstraction":"Class","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/20.html"},{"id":"CWE-295","name":"Improper Certificate Validation","description":"The product does not validate, or incorrectly validates, a certificate.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/295.html"}],"affected":[{"vendor":"cisco","product":"asyncos","name":"asyncos","label":"asyncos","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"≥ 10.5, < 10.5.5-005","noFixRecorded":false,"fixedIn":null},{"text":"≥ 11.5, < 11.5.2-020","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 10.5, < 10.5.5-005 | ≥ 11.5, < 11.5.2-020","eol":null,"hubHref":"/vendor/cisco/asyncos"},{"vendor":"cisco","product":"cisco web security appliance (wsa)","name":"Cisco Web Security Appliance (WSA)","label":"cisco web security appliance (wsa)","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ unspecified, < 10.5.5-005","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ unspecified, < 10.5.5-005","eol":null,"hubHref":"/vendor/cisco/cisco_web_security_appliance_wsa"},{"vendor":"cisco","product":"web_security_appliance","name":"web security appliance","label":"web_security_appliance","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"10.5.2-072","noFixRecorded":false,"fixedIn":null},{"text":"10.5.3-025","noFixRecorded":false,"fixedIn":null},{"text":"11.7.0-fcs-334","noFixRecorded":false,"fixedIn":null}],"versionsText":"10.5.2-072 | 10.5.3-025 | 11.7.0-fcs-334","eol":null,"hubHref":"/vendor/cisco/web_security_appliance"}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-wsa-dos","label":"tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-wsa-dos","hostname":"tools.cisco.com","tags":["Vendor Advisory","X Refsource CISCO"]},{"url":"http://www.securityfocus.com/bid/109049","label":"www.securityfocus.com/bid/109049","hostname":"www.securityfocus.com","tags":["VDB Entry","X Refsource BID","Third Party Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2019-07-04T19:50:10.367Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-11-19T19:03:49.939Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":35,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T11:14:59.796Z","stale":false,"partial":false}}